Auto label PRs (#1518)

chore: Automatically add labels to PRs, based on description

Co-authored-by: Arthur Silva Sens <arthursens2005@gmail.com>
Signed-off-by: Sachin Sahu <75629410+SachinSahu431@users.noreply.github.com>

---------

Signed-off-by: Sachin Sahu <75629410+SachinSahu431@users.noreply.github.com>
Signed-off-by: Sachin Sahu <sachinksahu.431@gmail.com>
Signed-off-by: Kemal Akkoyun <kakkoyun@users.noreply.github.com>
Co-authored-by: Kemal Akkoyun <kakkoyun@users.noreply.github.com>
Co-authored-by: Arthur Silva Sens <arthursens2005@gmail.com>

.github/labeler.yml

@@ -0,0 +1,34 @@
+# Config file for pr-auto-label workflow
+
+# enable auto-labeler on issues, prs, or both.
+enable:
+  prs: true
+
+# Labels is an object where:
+# - keys are labels
+# - values are objects of { include: [ pattern ], exclude: [ pattern ] }
+#    - pattern must be a valid regex, and is applied globally to
+#      title + description of issues and/or prs (see enabled config above)
+#    - 'include' patterns will associate a label if any of these patterns match
+#    - 'exclude' patterns will ignore this label if any of these patterns match
+labels:
+  'kind/BUGFIX':
+    include:
+      - '/kind (fix|bugfix)'
+    exclude: []
+  'kind/ENHANCEMENT':
+    include:
+      - '/kind enhancement'
+    exclude: []
+  'kind/FEATURE':
+    include:
+      - '/kind (feat|feature)'
+    exclude: []
+  'kind/CHANGE':
+    include:
+      - '/kind change'
+    exclude: []
+  'release-note-none':
+    include:
+      - '/kind (none|NONE|release-note-none|release-notes-none)'
+    exclude: []

.github/workflows/pr-auto-label.yml

@@ -0,0 +1,55 @@
+---
+name: PR-auto-labeler
+
+on:
+  pull_request_target:
+    types: [opened, edited, synchronize]
+
+permissions:
+    contents: read # the config file
+    pull-requests: write # for labeling pull requests (on: pull_request_target or on: pull_request)
+    statuses: write # to generate status
+    checks: write # to generate status
+
+jobs:
+  pr-labeler:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check Labels
+        id: labeler
+        uses: jimschubert/labeler-action@v1
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+# Adjust the configuration in /.github/labeler.yml
+
+  validate-pr-label:
+    runs-on: ubuntu-latest
+    needs: pr-labeler
+    steps:
+      - name: Verify Label
+        id: preview_label_check
+        uses: docker://agilepathway/pull-request-label-checker:latest
+        with:
+          any_of: kind/BUGFIX,kind/ENHANCEMENT,kind/FEATURE,kind/CHANGE,release-note-none
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          allow_failure: true
+      - name: Comment on Label Check Failure
+        uses: thollander/actions-comment-pull-request@v2.5.0
+        if: steps.preview_label_check.outputs.label_check == 'failure'
+        with:
+          message: |
+            PR body does not contain a valid type of change. Please refer to [CONTRIBUTING.md](https://github.com/prometheus/client_golang/blob/main/CONTRIBUTING.md#how-to-fill-the-pr-template) for more information.
+          comment_tag: labelfailure
+          mode: recreate
+      - name: Remove Label Check Failure Comment
+        uses: thollander/actions-comment-pull-request@v2.5.0
+        if: steps.preview_label_check.outputs.label_check == 'success'
+        with:
+          message: |
+            PR body contains a valid type of change.
+          comment_tag: labelfailure
+          mode: delete
+          create_if_not_exists: false
+      - name: Exit on Failure
+        if: steps.preview_label_check.outputs.label_check == 'failure'
+        run: exit 1

CONTRIBUTING.md

@@ -21,7 +21,7 @@ Prometheus uses GitHub to manage reviews of pull requests.
 
 * Be sure to sign off on the [DCO](https://github.com/probot/dco#how-it-works)
 
-## How to fill the PR template
+## How to write a PR description
 
 ### Describe your PR